<template>
  <el-container class="home">
    <el-header>
        <div>
            <img src="../assets/logo.png" alt="" width="60" height="60"><span>管理系统</span>
        </div>
        <el-button type="info" @click="logout">退出</el-button>
    </el-header>
        <el-container>
            <el-aside :width="isCollapse ? '64px' : '200px'">
                <div class="toggle-button" @click="toggleCollapse">|||</div>
                <el-menu background-color="#fff" text-color="black" active-text-color="#409EFF"  unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
                    <el-submenu :index="item.id + ''" v-for="item in menu" :key="item.id">
                        <template slot="title">
                            <i class="el-icon-s-grid"></i>
                            <span>{{item.authName}}</span>
                        </template>
                        <el-menu-item :index="'/' + subitem.path" v-for="subitem in item.children" :key="subitem.id" @click="saveNavState('/' + subitem.path)">
                            <template slot="title">
                            <i class="el-icon-menu"></i>
                            <span>{{subitem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>
                </el-menu>
            </el-aside>
            <el-main>
                <router-view></router-view>
            </el-main>
        </el-container>
  </el-container>
</template>

<script>
export default {
    data () {
        return {
            menu: [],
            isCollapse: false,
            activePath: ''
        }
    },
    created () {
        this.getMenu()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout () {
            window.sessionStorage.clear()
            this.$router.push('/login')
        },
        async getMenu () {
            const { data: res } = await this.$http.get('menus')
            if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
            this.menu = res.data
        },
        toggleCollapse () {
            this.isCollapse = !this.isCollapse
        },
        saveNavState(activePath) {
            window.sessionStorage.setItem('activePath', activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style lang="less" scoped>
.el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-left: 0;
    color: #fff;
    font-size: 20px;
    > div {
        display: flex;
        align-items: center;
        span {
            margin-left: 15px;
        }
    }
}
.el-aside {
    background-color: #333744;
    .el-menu {
        border-right: none;
    }
}
.el-main {
    background-color: #eaedf1;
}
.home {
    height: 100%;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
